Calculate the pH of the following acid solutions at 25 °C: (a) 1.0 x 10-4 M H3BO3(aq) (boric acid acts as a monoprotic acid), (b) 0.015 M H3PO4 (aq), (c) 0.10 M H2SO3(aq). Values for the successive acidity constants for each of these acids are given in the below table. Table 5E.1Successive acidity constants of polyprotic acids at 298.15 KAcidpKa1K2pK2pKa3Carbonic acid, H,CO34.3 x 10-76.375.6 x 10-1110.251.3 x 10Hydrosulfuric acid, H,SEthanedioic acid (oxalic acid), (COOH),6.887.1 x 10-1514.155.9 x 10-21.236.5 x 10-54.19Phosphoric acid, H3PO47.6 x 10-32.126.2 x 10-87.212.1 x 10-1312.67Phosphorous acid, H,PO3Sulfuric acid, H,SO41.0 x 10-22.002.6 x 10-76.59Strong1.2 x 10-21.92Sulfurous acid, H2SO31.5 x 10-21.811.2 x 10-76.91Tartaric acid, C,H,O2(COOH),6.0 x 10-43.221.5 x 10-54.82

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Answered: Table 5E.1 Successive acidity constants…

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter15: Solutions Of Acids And Bases

Section: Chapter Questions

Problem 15.30QE

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Calculate the pH of the following acid solutions at 25 °C: (a) 1.0 x 10^-4 M H₃BO₃(aq) (boric acid acts as a monoprotic acid), (b) 0.015 M H₃PO₄ (aq), (c) 0.10 M H₂SO₃(aq). Values for the successive acidity constants for each of these acids are given in the below table.

Table 5E.1
Successive acidity constants of polyprotic acids at 298.15 K
Acid
pKa1
K2
pK2
pKa3
Carbonic acid, H,CO3
4.3 x 10-7
6.37
5.6 x 10-11
10.25
1.3 x 10
Hydrosulfuric acid, H,S
Ethanedioic acid (oxalic acid), (COOH),
6.88
7.1 x 10-15
14.15
5.9 x 10-2
1.23
6.5 x 10-5
4.19
Phosphoric acid, H3PO4
7.6 x 10-3
2.12
6.2 x 10-8
7.21
2.1 x 10-13
12.67
Phosphorous acid, H,PO3
Sulfuric acid, H,SO4
1.0 x 10-2
2.00
2.6 x 10-7
6.59
Strong
1.2 x 10-2
1.92
Sulfurous acid, H2SO3
1.5 x 10-2
1.81
1.2 x 10-7
6.91
Tartaric acid, C,H,O2(COOH),
6.0 x 10-4
3.22
1.5 x 10-5
4.82

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